US7073444B2 - Method for checking the quality of flat workpieces and device for carrying out said method - Google Patents

Method for checking the quality of flat workpieces and device for carrying out said method Download PDF

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Publication number
US7073444B2
US7073444B2 US10/846,716 US84671604A US7073444B2 US 7073444 B2 US7073444 B2 US 7073444B2 US 84671604 A US84671604 A US 84671604A US 7073444 B2 US7073444 B2 US 7073444B2
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Prior art keywords
workpieces
pile
blanks
printing
registering
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Expired - Fee Related, expires
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US10/846,716
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US20040251176A1 (en
Inventor
Jeronimo Alonso
Georg Strasser
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Bobst Mex SA
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Bobst SA
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Assigned to BOBST SA reassignment BOBST SA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: STRASSER, GEORG, ALONSO, JERONIMO
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
    • B65H29/58—Article switches or diverters
    • B65H29/62—Article switches or diverters diverting faulty articles from the main streams
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/0002—Inspection of images, e.g. flaw detection
    • G06T7/0004—Industrial image inspection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2100/00—Rigid or semi-rigid containers made by folding single-piece sheets, blanks or webs
    • B31B2100/002—Rigid or semi-rigid containers made by folding single-piece sheets, blanks or webs characterised by the shape of the blank from which they are formed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2120/00—Construction of rigid or semi-rigid containers
    • B31B2120/30—Construction of rigid or semi-rigid containers collapsible; temporarily collapsed during manufacturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B31B50/006—Controlling; Regulating; Measuring; Improving safety
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B31B50/02—Feeding or positioning sheets, blanks or webs
    • B31B50/04—Feeding sheets or blanks
    • B31B50/06—Feeding sheets or blanks from stacks
    • B31B50/066—Feeding sheets or blanks from stacks from above a magazine
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00—Indexing scheme for image analysis or image enhancement
    • G06T2207/30—Subject of image; Context of image processing
    • G06T2207/30108—Industrial image inspection
    • G06T2207/30124—Fabrics; Textile; Paper

Definitions

  • the present invention relates to a method for checking the quality of flat workpieces and to a device for carrying out that method, particularly for box making machines used, for example, in the manufacture of folding boxes from a web or sheet matter, like cardboard.
  • Such machines comprise a plurality of stations arranged one after another enabling them to print the matter, to diecut it according to a required form by means of a plane or rotary tool, to strip the wastes resulting from diecutting, then to check the production quality before collecting the box cuttings, i.e. blanks, into a delivery station.
  • This control is usually automatically processed into the production line. Before stacking of workpieces into the delivery station, this control enables stripping of the blanks that are not in conformity with the minimal printing and/or diecutting quality requirements required for the printing.
  • One of said devices comprises a camera connected to a device for image processing.
  • the camera operates by registering and storing the position of register marks located on the front waste portion of a sheet.
  • This front waste portion also presents a gripping surface used by a gripper bar for seizing each sheet and conveying the sheets successively from the first station to the last station, by means of an endless gripper bar chain connected to a gripper bar.
  • the camera allows registering an image of the front waste portion where the printing and diecutting register marks are located.
  • the device for image processing is then able to determine if allowances related to printing and diecutting quality are required.
  • that device is however limited to a register control of colors between themselves and to a positioning control of the print with respect to diecutting. But it does not enable registering print defects located anywhere onto the whole print surface.
  • Each one of the printing units of the printing station is likely to generate various defects looking like trains, ridges, spots, intensity variations or even non-printed areas, for example.
  • the device of patent CH692847 registered such defects on the surface of a whole printed web.
  • the defects that are registering are processed on the whole surface of a print format by a camera, and are then compared with the print of a single reference motif, which previously had been recorded.
  • the web print format usually comprises a plurality of blanks evenly distributed with one another in order to reduce the inserted waste as much as possible.
  • the outline of each blank corresponds to a flat box, in a developed shape.
  • the maximal print format is defined by the geometrical dimensions of the printing units cylinders, i.e. by the width and the circumference of the printing cylinders, or by the width of the print substrate, i.e. the sheets or the processed web width.
  • the stripping of waste portions is usually related to the print quality control within a production line, from which the stripping results thus more usually directly.
  • U.S. Pat. No. 5,235,883 discloses a stripping system including two flaps arranged side by side and occupying the whole width of the diecutting web. It is possible to independently drive one or the other flap so as to strip only the blank having a print defect.
  • This system can satisfactorily work for blanks ranging from medium to large sizes. But, it is not effective when it is used for small sizes blanks, like cigarette packaging, for example. If the web width can indeed comprise up to ten blanks, it would be necessary to provide as many independently movable flaps. One understands that such a device would quickly become too delicate, complicated and even expensive for production.
  • the width and number of the flaps are necessarily related to the width and the number of blanks per line, that device would not be convenient for job changes, e.g., changing from a ten blanks printing to another printing of only six blanks per line.
  • the blanks of a same sheet or a same printing format which is intended for processing cigarette packaging will not all be the same but will usually comprise a mixing of some blanks that are slightly different from one another.
  • the plurality of models will thus cause new inconvenience while automatically registering print defects, mainly during comparison between not only one main reference model, but between a range of several suitable models slightly different from one another.
  • the aim of the present invention is to obviate the above drawbacks and to overcome, at least partly, the inconvenience of the abovementioned solution, while providing a method for checking the quality of flat workpieces and to provide a device for automatically carrying out said method.
  • the invention enables production quality to be ensured at a hundred percent, thus avoiding the return of defect series.
  • the waste can be reduced to a minimal value, and the needed work force can be of only one person for manual sorting, despite high production rates. Stuffings like the ones due to bad stripping, as well as the resulting machines stoppages, can now be fully avoided.
  • the solution of the present invention also has economic advantages. Moreover, obtaining whole blanks piles, without any inconvenience during production, is also guaranteed.
  • the device of the invention is also solid and is movable.
  • FIG. 1 shows an elevation view of an example of a production line as known from the present state of the art
  • FIG. 2 shows a plan view of a printed web portion
  • FIG. 3 shows an elevation view of the device for checking the quality of flat workpieces in the present invention
  • FIGS. 4 a , 4 b et 4 c show respectively the detail of a usual blanks pile, the one of a reference pile comprising three blanks as well as the schematic description of said three blanks taken as reference models.
  • FIG. 1 shows a schematic view of a machine 1 producing packaging intended for the manufacture of folding boxes starting from a web material 2 .
  • This machine or production line comprises firstly a web unwinder 3 that supports rollers 4 made of cardboard, for example.
  • An infeed station 5 enables the web 2 to be conveyed toward the first printing unit 6 of the printing station 7 in the traveling direction of the web, illustrated by arrow 8 .
  • the four successive printing units shown in FIG. 1 enable achieving a standard four-color printing.
  • the web 2 is printed with a printing format 10 during each entire travel of the printing cylinders of the different printing units.
  • the format 10 is shown in this Figure with broken lines. Blanks 11 of a same format 10 are arranged in lines 12 , or rows 13 along the traveling direction of the web 2 as shown by arrow 8 . Each blank 11 is shown as a box in a developed form, having future folding sections which are also shown. For the clarity of the Figure, the printing patterns of these boxes are not shown here. Accordingly, note that the terms of blanks, box cuttings or more commonly flat workpieces are interchangeably used with reference to the same workpieces 11 . However, for practical reasons due to the length of these terms, the term blanks instead of said other two will be used in the following description.
  • the web 2 reaches a quality control station 15 aiming to check if printing was not spotted with defects like burrs, printing holes, stray lines, etc. . . .
  • That checking especially if it is processed by a camera 16 registering the whole surface of a printing format 10 determines, by comparison to a stored format taken as an example, if the portion of the registered web is spotted with a defect. If that is the case, the control device of this station 15 is able to define into which line 12 and which row 13 of the format 10 the defect was registered.
  • the web is conveyed into a diecutting station 17 .
  • the station will sort all the blanks 11 from the rest of the web 2 while usually producing inserted waste 18 that is immediately collected. Blanks 11 then move in a shingling manner into a delivery station 19 before being piled up in rows and forming piles 21 that can be palletized for storage or for being conveyed outside the production line 1 .
  • the production line shown in FIG. 1 uses a web material and a rotary diecutting station. However, note that it may use a production line using sheets of a large format as the print substrate, instead of using a web material, and may use a platen for flatbed diecutting, instead of using a rotary diecutting device. There are many other alternatives for illustrating such a production line, like the removal of the quality control station 15 , for example.
  • FIG. 3 is an elevation view of the quality control device of the invention.
  • This device 30 is an independent unit of the machine or production line 1 and is intended for registering the printing and/or diecutting quality of the blanks 11 issued from the delivery station 19 .
  • the device 30 comprises, upstream to downstream, an infeed station 40 of blanks 11 , a conveyor 50 for conveying blanks throughout a registering area 60 , a stripping station 70 and then a delivery station 80 for registered blanks according to the minimal quality requirements.
  • the Device 30 comprises a frame 31 mounted on wheels 32 making it easily movable.
  • the infeed unit 40 especially comprises a table 41 on which at least one pile 21 of blanks 11 can be loaded. That table is vertically moved by a piston 42 that enables positioning the top of the pile 21 at a constant level to ensure a correct infeed of blanks 11 onto the conveyor 50 .
  • the vertical movement of the table can be either mechanically controlled, using a compression spring for example, pneumatically or hydraulically controlled when using a piston, or may even be electrically controlled by an engine, for example.
  • the infeed device can effectively comprise various electronic devices and/or optical, even electrical ones, for ensuring motion control of the table 41 .
  • the infeed unit is equipped with an infeed device 43 arranged above the pile 21 so that the blank located at the top of the pile can be conveyed in the direction of arrow 38 through the infeed device 43 when it is set in motion.
  • the device 43 can be represented by an apron, belts, rollers or by a device with suction cups, for example.
  • an infeed device 40 may comprise a device for feeding blanks through the bottom of the latter instead of their top.
  • the infeed embodiment shown in FIG. 3 avoids the variable pressure exerted by the permanently reduced weight of the pile and ensures a constant optimal pressure of each blank against the infeed device 43 .
  • the upper part of the conveyor 50 may comprise an alignment area 55 into which each blank is aligned, through an aligning device 56 , parallel to one of the longitudinal ends of the conveyor so that the blank is always horizontally positioned with a permanent angle.
  • the conveyor can also comprise a suction mechanism like the one for the abovementioned suction chamber 44 .
  • the conveyor 50 can be advantageously represented by one or several bored aprons, belts, or even driven rollers.
  • the device at the registering area 60 comprises at least a camera 61 mounted above the conveyor 50 and oriented downwardly so as to face the printed surface of the blanks.
  • a lighting device 62 ensures sufficient light in the registered area. This light can be the one of flash-lights or a permanent light, for example. If necessary, a light of a certain wave length may be used in order to better increase the light contrast of the printed patterns.
  • This device can comprise at least one deviation device 71 that, when actuated, forces downward deviation of the defective blank 11 , which then falls down then into a collecting tank 72 .
  • That station can simply comprise a receptacle 81 in which all corresponding blanks are delivered in at least one new pile 22 .
  • the receptacle 81 could advantageously be vertically moved downwardly so that the level of the top of the new pile 22 remains the same.
  • the mechanism enabling this vertical movement can be identical to the displacement of the table 41 and it can also, if necessary, depend on signals possibly emitted electromechanically or by photocell sensors.
  • the delivery device may be equipped with a jogger (not shown) that is actuated by swivelling units enabling the alignment of the sides of the new piles 22 or the vibration of the piles in order to pile up evenly aligned blanks.
  • a jogger (not shown) that is actuated by swivelling units enabling the alignment of the sides of the new piles 22 or the vibration of the piles in order to pile up evenly aligned blanks.
  • One aim of the invention is to ensure formation of entire piles, i.e. piling up new piles 22 with a permanent blanks number required according to a user requirement.
  • This number value can be stored as a register parameter n previously infed during the first processing stages of the present invention. That value would meet the number of blanks which all new piles 22 should comprise according to customer or manufacturer requirements.
  • the device 30 is able to pile up several new piles 22 comprising each n blanks 11 coming within quality requirements.
  • the various units and members of device 30 can advantageously be driven and controlled by a central unit 100 comprising a computer 101 to which a control interface 102 , like a keyboard or a touch screen keyboard, and an output peripheral 103 like a screen or a printer, for example, can be connected.
  • the central unit 100 has a specific software and drives, for example, the raising of table 42 , the processing speed of the infeed device 43 and of the conveyor 50 , the aligning device 56 , the camera 61 and the lighting lamps 62 , the stripping device 71 and the receptacle lowering.
  • the central device 100 advantageously also enables the control over various severe situations by means of register sensors. It is thus possible to register the passage end of pile 21 , alignment defects of blanks 11 within the alignment area 55 , a light defect or a malfunctioning of the stripping device 71 .
  • the central device 100 also primarily enables control over operations processed into the registering area 60 . It enables registering all kind of possible defects and defining their suitable quality limits. Acting in that way, the camera 61 enables, through the analysis of each image pixel of the blank, registering outlines of the blank, the lines of color changes, the flatbed areas, all color intensities, etc. A previously recorded reference model in the central device 100 and various parameters allow the limits to make it possible to register with comparison each printing and diecutting defect of each blank.
  • FIGS. 4 a , 4 b et 4 c refer to the drawback of different types of blanks 11 a , 11 b , 11 c , about three blanks by the non-limitative example, intended to be in a same pile 21 ( FIG. 4 a ).
  • this drawback refers to blanks having a few small differences between one another, like distinct writings printed onto cigarettes packaging of the same cartridge.
  • FIG. 4 c shows three kinds of reference blanks Ma, Mb, Mc with a pattern showing a sun each time appearing slightly different.
  • the device 30 might register these reference blanks and not assign any one of the differences to a print defect, it is advisable to have the device ready for registering all of the various blanks types to be found into a pile 21 .
  • an operation infeeds a reference pile 20 into table 41 ( FIG. 4 b ) made of reference blanks Ma, Mb, Mc, . . . Mz, of faultless quality.
  • the operator checks that this reference pile 20 is comprised of at least all different blanks types, according to the example of the three blanks types 11 a , 11 b , 11 c shown by the reference blanks Ma, Mb, Mc.
  • the device 30 is going to register all blanks in the reference pile 20 and store their images.
  • the central device 100 is able to automatically register and count the various blanks types by comparing small differences with the previously recorded reference blanks. If several reference blanks of a same type are registered during the registering process, their images can advantageously be brought about before being stored. Thus, several blanks passages of the same reference pile 20 could also be processed so as to bring about the registered images during each passage.
  • the central device 100 will have stored as many reference images as there are blanks of different types. As shown in FIGS.
  • the central device will thus have stored three reference images related to images of the reference blanks Ma, Mb and Mc.
  • the device advantageously does not constrain manual infeed one by one of the reference blanks for storing their image. Moreover, since counting of the different possible blanks types is also automatically carried out, the process makes initializing operation of device 30 easier.
  • the successive and preferred stages of the process enable advantageous use of the device for blanks 11 processed through a printing and/or diecutting machine 1 , which may or may not comprise a quality checking station 15 , the stages comprising the following:
  • the device 30 of the present invention for checking the quality could be related to the production line through an automated conveyor that could convey the products, or piles 21 , issued from the delivery station of the production line 1 and automatically feed them into the infeed station of the device 30 . Automatic loading of the piles 21 , as described above, would thus become interdependent with the production line 1 , in particular its production rate.
  • automating the manufacturing operations processed into the delivery station 80 could be intended for removing the new piles 22 onto a palette, an apron or an evacuation carriage so as to free the full space into the receptacle 81 .
  • the number of piles that are at the infeed station 40 and are at the delivery station 80 only depends on a plurality of alternatives that may be possibly added to the device of the present invention.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Making Paper Articles (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
  • Controlling Sheets Or Webs (AREA)
  • Printing Methods (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
US10/846,716 2003-05-16 2004-05-14 Method for checking the quality of flat workpieces and device for carrying out said method Expired - Fee Related US7073444B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH20030873/03 2003-05-16
CH00873/03A CH696527A5 (fr) 2003-05-16 2003-05-16 Procédé de contrôle de la qualité d'éléments plats et dispositif pour la mise en oeuvre de ce procédé.

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US20040251176A1 US20040251176A1 (en) 2004-12-16
US7073444B2 true US7073444B2 (en) 2006-07-11

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US (1) US7073444B2 (zh)
EP (1) EP1477297A3 (zh)
JP (1) JP4264383B2 (zh)
KR (1) KR100617922B1 (zh)
CN (1) CN100362340C (zh)
CA (1) CA2466753C (zh)
CH (1) CH696527A5 (zh)

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US10642551B2 (en) 2017-07-14 2020-05-05 Georgia-Pacific Corrugated Llc Engine for generating control plans for digital pre-print paper, sheet, and box manufacturing systems
US11449290B2 (en) 2017-07-14 2022-09-20 Georgia-Pacific Corrugated Llc Control plan for paper, sheet, and box manufacturing systems
US11478938B2 (en) * 2017-04-25 2022-10-25 Kawasaki Jukogyo Kabushiki Kaisha Sheet conveying device and sheet conveying method
US11485101B2 (en) 2017-07-14 2022-11-01 Georgia-Pacific Corrugated Llc Controls for paper, sheet, and box manufacturing systems
US11520544B2 (en) 2017-07-14 2022-12-06 Georgia-Pacific Corrugated Llc Waste determination for generating control plans for digital pre-print paper, sheet, and box manufacturing systems
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US11093186B2 (en) 2017-07-14 2021-08-17 Georgia-Pacific Corrugated Llc Engine for generating control plans for digital pre-print paper, sheet, and box manufacturing systems
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US11520544B2 (en) 2017-07-14 2022-12-06 Georgia-Pacific Corrugated Llc Waste determination for generating control plans for digital pre-print paper, sheet, and box manufacturing systems
US11807480B2 (en) 2017-07-14 2023-11-07 Georgia-Pacific Corrugated Llc Reel editor for pre-print paper, sheet, and box manufacturing systems
US11907595B2 (en) 2017-07-14 2024-02-20 Georgia-Pacific Corrugated Llc Control plan for paper, sheet, and box manufacturing systems
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JP2004338406A (ja) 2004-12-02
CA2466753A1 (en) 2004-11-16
EP1477297A2 (fr) 2004-11-17
KR100617922B1 (ko) 2006-08-30
EP1477297A3 (fr) 2006-01-25
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KR20040099173A (ko) 2004-11-26
CH696527A5 (fr) 2007-07-31

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